U.S. patent application number 15/662924 was filed with the patent office on 2017-11-16 for non-orthogonal multiple access transmission method, base station, and ue.
The applicant listed for this patent is Huawei Technologies Co., Ltd.. Invention is credited to Yuanjie Li.
Application Number | 20170331573 15/662924 |
Document ID | / |
Family ID | 56542234 |
Filed Date | 2017-11-16 |
United States Patent
Application |
20170331573 |
Kind Code |
A1 |
Li; Yuanjie |
November 16, 2017 |
Non-Orthogonal Multiple Access Transmission Method, Base Station,
and UE
Abstract
Embodiments of the present disclosure disclose a non-orthogonal
multiple access transmission method, a base station, and UE. The
method includes: configuring a new transmission mode for first UE,
and notifying the first UE of the configured new transmission mode,
where the new transmission mode indicates: a transmission signal of
second UE located in a same cell as the first UE is superposed on a
time-frequency resource allocated to the first UE, and the second
UE is interfering UE of the first UE; and sending first downlink
control signaling to the first UE, so that the first UE
demodulates, according to the first downlink control signaling,
received data sent by a base station, where the first downlink
control signaling includes scheduling indication information of the
first UE and scheduling indication information of the second
UE.
Inventors: |
Li; Yuanjie; (Shanghai,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Huawei Technologies Co., Ltd. |
Shenzhen |
|
CN |
|
|
Family ID: |
56542234 |
Appl. No.: |
15/662924 |
Filed: |
July 28, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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PCT/CN2015/072013 |
Jan 30, 2015 |
|
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15662924 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 72/1289 20130101;
H04J 11/0036 20130101; H04L 5/0037 20130101; H04J 1/04 20130101;
H04L 5/0094 20130101; H04J 1/06 20130101 |
International
Class: |
H04J 1/04 20060101
H04J001/04; H04W 72/12 20090101 H04W072/12; H04J 1/06 20060101
H04J001/06 |
Claims
1. A first user equipment (UE), comprising: a processor; and a
receiver; wherein the processor is configured to: control the
receiver to receive configuration information of a transmission
mode, wherein the transmission mode indicates that a base station
has superposed a transmission signal, of a second UE located in a
same cell as the first UE, on a time-frequency resource allocated
by the base station to the first UE, and the second UE is
interfering UE of the first UE; control, in the transmission mode,
the receiver to receive downlink control signaling, wherein the
downlink control signaling comprises scheduling indication
information of the first UE and scheduling indication information
of the second UE; and demodulate, according to the downlink control
signaling, received data from the base station.
2. The first UE according to claim 1, wherein in the transmission
mode, when the first UE demodulates data using a user-specific
reference signal, and the second UE demodulates data by using the
user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
comprises a resource location indication, a modulation and coding
scheme, a quantity of hybrid automatic repeat request processes,
new data indicator information, redundancy version information, a
ratio of energy per resource element (EPRE) of a pilot to EPRE of
data of the first UE, a transport layer quantity, or antenna port
information; and wherein the scheduling indication information of
the second UE in the downlink control signaling comprises a radio
network temporary identifier, a modulation and coding scheme,
antenna port information, a ratio of the EPRE of the pilot to EPRE
of data of the second UE, a ratio of the EPRE of the data of the
first UE to EPRE of data of the second UE, data power information,
or transport layer quantity information.
3. The first UE according to claim 1, wherein in the transmission
mode, when the first UE demodulates data using a user-specific
reference signal, and the second UE demodulates data by using a
cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
comprises: a resource location indication, a modulation and coding
scheme, rank information, a codebook matrix index, a quantity of
hybrid automatic repeat request processes, new data indicator
information, redundancy version information, a transport layer
quantity, or antenna port information; and wherein the scheduling
indication information of the second UE in the downlink control
signaling comprises a radio network temporary identifier, a
modulation and coding scheme, a ratio PA of a data subcarrier power
of an orthogonal frequency division multiplexing (OFDM) symbol
without a pilot to a pilot subcarrier power, a ratio PB of a data
subcarrier power of an OFDM symbol with a pilot to a pilot
subcarrier power, or a transmission mode.
4. The first UE according to claim 1, wherein in the transmission
mode, when the first UE demodulates data using a cell-specific
reference signal, and the second UE demodulates data using the
cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
comprises a resource location indication, a modulation and coding
scheme, rank information, a codebook matrix index, a quantity of
hybrid automatic repeat request processes, new data indicator
information, redundancy version information, or antenna port
information; and wherein the scheduling indication information of
the second UE in the downlink control signaling comprises a ratio
PA of a data subcarrier power of an orthogonal frequency division
multiplexing (OFDM) symbol without a pilot to a pilot subcarrier
power, a ratio PB of a data subcarrier power of an OFDM symbol with
a pilot to a pilot subcarrier power, a radio network temporary
identifier, or a modulation and coding scheme.
5. The first UE according to claim 1, wherein in the transmission
mode, when the first UE demodulates data using a cell-specific
reference signal, and the second UE demodulates data using a
user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
comprises a resource location indication, a modulation and coding
scheme, rank information, a codebook matrix index, a quantity of
hybrid automatic repeat request processes, new data indicator
information, or redundancy version information; and wherein the
scheduling indication information of the second UE in the downlink
control signaling comprises a radio network temporary identifier, a
transmission mode, a modulation and coding scheme, antenna port
information, a transport layer quantity, a ratio of energy per
resource element (EPRE) of data of the first UE to EPRE of data of
the second UE, a ratio of EPRE of data of the first UE to EPRE of a
dedicated pilot of the second UE, or dedicated pilot power
information.
6. The first UE according to claim 1, wherein the scheduling
indication information of the second UE in the downlink control
signaling further comprises new data indicator information of the
second UE, or redundancy version information of the second UE.
7. The first UE according to claim 1, wherein the scheduling
indication information of the first UE in the downlink control
signaling comprises a resource location indication, a modulation
and coding scheme, a ratio of energy per resource element (EPRE) of
a pilot to EPRE of data of the first UE, a ratio of EPRE of data of
the first UE to EPRE of data of the second UE, antenna port
information, a quantity of hybrid automatic repeat request
processes, new data indicator information, or redundancy version
information; and wherein the scheduling indication information of
the second UE in the downlink control signaling comprises a
resource location indication, a modulation and coding scheme, a
ratio of the EPRE of the pilot to the EPRE of the data of the
second UE, antenna port information, a quantity of hybrid automatic
repeat request processes, new data indicator information, or
redundancy version information.
8. A method, comprising: receiving, by a first user equipment (UE),
configuration information of a transmission mode from a base
station, wherein the transmission mode indicates that the base
station has superposed a transmission signal, of a second UE
located in a same cell as the first UE, on a time-frequency
resource allocated by the base station to the first UE, and the
second UE is interfering UE of the first UE; receiving, by the
first UE in the transmission mode, downlink control signaling from
the base station, wherein the downlink control signaling comprises
scheduling indication information of the first UE and scheduling
indication information of the second UE; and demodulating, by the
first UE according to the downlink control signaling, received data
from the base station.
9. The method according to claim 8, wherein in the transmission
mode, when the first UE demodulates data using a user-specific
reference signal, and the second UE demodulates data using the
user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
comprises a resource location indication, a modulation and coding
scheme, a quantity of hybrid automatic repeat request processes,
new data indicator information, redundancy version information, a
ratio of energy per resource element (EPRE) of a pilot to EPRE of
data of the first UE, a transport layer quantity, or antenna port
information; and wherein the scheduling indication information of
the second UE in the downlink control signaling comprises a radio
network temporary identifier, a modulation and coding scheme,
antenna port information, a ratio of the EPRE of the pilot to EPRE
of data of the second UE, a ratio of the EPRE of the data of the
first UE to EPRE of data of the second UE, data power information,
or transport layer quantity information.
10. The method according to claim 8, wherein in the transmission
mode, when the first UE demodulates data using a user-specific
reference signal, and the second UE demodulates data using a
cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
comprises a resource location indication, a modulation and coding
scheme, rank information, a codebook matrix index, a quantity of
hybrid automatic repeat request processes, new data indicator
information, redundancy version information, a transport layer
quantity, or antenna port information; and wherein the scheduling
indication information of the second UE in the downlink control
signaling comprises a radio network temporary identifier, a
modulation and coding scheme, a ratio PA of a data subcarrier power
of an orthogonal frequency division multiplexing (OFDM) symbol
without a pilot to a pilot subcarrier power, a ratio PB of a data
subcarrier power of an OFDM symbol with a pilot to a pilot
subcarrier power, or a transmission mode.
11. The method according to claim 8, wherein in the transmission
mode, when the first UE demodulates data using a cell-specific
reference signal, and the second UE demodulates data using the
cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
comprises a resource location indication, a modulation and coding
scheme, rank information, a codebook matrix index, a quantity of
hybrid automatic repeat request processes, new data indicator
information, redundancy version information, or antenna port
information; and wherein the scheduling indication information of
the second UE in the downlink control signaling comprises a ratio
PA of a data subcarrier power of an orthogonal frequency division
multiplexing (OFDM) symbol without a pilot to a pilot subcarrier
power, a ratio PB of a data subcarrier power of an OFDM symbol with
a pilot to a pilot subcarrier power, a radio network temporary
identifier, or a modulation and coding scheme.
12. The method according to claim 8, wherein in the transmission
mode, when the first UE demodulates data using a cell-specific
reference signal, and the second UE demodulates data using a
user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
comprises a resource location indication, a modulation and coding
scheme, rank information, a codebook matrix index, a quantity of
hybrid automatic repeat request processes, new data indicator
information, or redundancy version information; and wherein the
scheduling indication information of the second UE in the downlink
control signaling comprises a radio network temporary identifier, a
transmission mode, a modulation and coding scheme, antenna port
information, a transport layer quantity, a ratio of energy per
resource element (EPRE) of data of the first UE to EPRE of data of
the second UE, a ratio of EPRE of data of the first UE to EPRE of a
dedicated pilot of the second UE, or dedicated pilot power
information.
13. The method according to claim 8, wherein the scheduling
indication information of the second UE in the downlink control
signaling further comprises new data indicator information of the
second UE, or redundancy version information of the second UE.
14. The method according to claim 8, wherein the scheduling
indication information of the first UE in the downlink control
signaling comprises a resource location indication, a modulation
and coding scheme, a ratio of energy per resource element (EPRE) of
a pilot to EPRE of data of the first UE, a ratio of EPRE of data of
the first UE to EPRE of data of the second UE, antenna port
information, a quantity of hybrid automatic repeat request
processes, new data indicator information, or redundancy version
information; and wherein the scheduling indication information of
the second UE in the downlink control signaling comprises a
resource location indication, a modulation and coding scheme, a
ratio of the EPRE of the pilot to the EPRE of the data of the
second UE, antenna port information, a quantity of hybrid automatic
repeat request processes, new data indicator information, or
redundancy version information.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of International
Application No. PCT/CN2015/072013, filed on Jan. 30, 2015, the
disclosure of which is hereby incorporated by reference in its
entirety.
TECHNICAL FIELD
[0002] Embodiments of the present disclosure relate to the field of
communications technologies, and in particular, to a non-orthogonal
multiple access transmission method, a base station, and UE.
BACKGROUND
[0003] In a non-orthogonal multiple access (NOMA) technology, one
resource may be allocated to multiple users, and different powers
are allocated to different users to implement multiple access
transmission, so as to improve resource utilization. For example, a
base station superposes transmission data of two users on a same
time-frequency resource, one user is located on a cell edge, and
the other user is located in a cell center. In terms of power
allocation, more powers are allocated for data transmission of the
user located on the cell edge, and a relatively low power is
allocated for data transmission of the user located in the cell
center. At a receive end, a user receives a result obtained by
superposing the data of the two users. For the user located on the
cell edge, the data of the user located in the cell center is
equivalent to interference generated after superposing. However,
because a relatively high power is allocated for data transmission
of the user located on the cell edge, with a proper bit rate and
modulation scheme configuration, it can be ensured that the user
located on the cell edge successfully demodulates data of the user
located on the cell edge. After receiving a mixed signal, the user
located in the cell center first detects the data (that is, an
interfering signal) of the user located on the cell edge, and then,
cancels the interfering signal by using an interference
cancellation algorithm, so that data of the user located in the
cell center remains. In spite of a relatively low power, the user
located in the cell center has a relatively good channel condition
due to a short distance to the base station, and with a proper bit
rate and modulation scheme configuration, the user located in the
cell center can also successfully demodulate the data of the user
located in the cell center.
[0004] In NOMA, multiple multiplexing users are distinguished by
using different powers, and are not required to implement mutual
orthogonality or low correlation by means of precoding. However, in
a Long Term Evolution (LTE) system, for example, in a transmission
mode 9 in LTE, the multiple users are distinguished by means of
orthogonal precoding, instead of by using different powers. An
existing study on the NOMA technology in the industry mainly
focuses on improvement and optimization of a transmission solution,
how to combine the NOMA technology with multiple-input
multiple-output (MIMO), and the like. For how to introduce a NOMA
transmission mode into the LTE system, there is still no relevant
solution.
SUMMARY
[0005] In view of this, embodiments of the present disclosure
provide a non-orthogonal multiple access transmission method, a
base station, and UE, so that a NOMA transmission manner can be
introduced into an LTE system, and spectrum utilization can be
improved.
[0006] According to a first aspect, a base station is provided in
an embodiment of the present disclosure. The base station includes
a first configuration unit, configured to: configure a new
transmission mode for first user equipment UE, and notify the first
UE of the configured new transmission mode, where the new
transmission mode indicates: a transmission signal of second UE
located in a same cell as the first UE is superposed on a
time-frequency resource allocated to the first UE, and the second
UE is interfering UE of the first UE. The base station also
includes a first sending unit, configured to send first downlink
control signaling to the first UE, so that the first UE
demodulates, according to the first downlink control signaling,
received data sent by the base station, where the first downlink
control signaling includes scheduling indication information of the
first UE and scheduling indication information of the second
UE.
[0007] With reference to the first aspect, in a first
implementation manner of the first aspect, when the first
configuration unit configures the new transmission mode for the
first UE, the first UE demodulates data by using a user-specific
reference signal, and the second UE also demodulates data by using
the user-specific reference signal, the scheduling indication
information of the first UE in the first downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, redundancy
version information, a ratio of energy per resource element EPRE of
a pilot to EPRE of data of the first UE, a transport layer
quantity, or antenna port information; and the scheduling
indication information of the second UE in the first downlink
control signaling specifically includes one or more types of the
following information of the second UE: a radio network temporary
identifier, a modulation and coding scheme, antenna port
information, a ratio of the EPRE of the pilot to EPRE of data of
the second UE, a ratio of the EPRE of the data of the first UE to
EPRE of data of the second UE, data power information, or transport
layer quantity information.
[0008] With reference to the first aspect, in a second
implementation manner of the first aspect, when the first
configuration unit configures the new transmission mode for the
first UE, the first UE demodulates data by using a user-specific
reference signal, and the second UE demodulates data by using a
cell-specific reference signal, the scheduling indication
information of the first UE in the first downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, redundancy version information, a
transport layer quantity, or antenna port information; and the
scheduling indication information of the second UE in the first
downlink control signaling specifically includes one or more types
of the following information of the second UE: a radio network
temporary identifier, a modulation and coding scheme, a ratio PA of
a data subcarrier power of an orthogonal frequency division
multiplexing OFDM symbol without a pilot to a pilot subcarrier
power, a ratio PB of a data subcarrier power of an OFDM symbol with
a pilot to a pilot subcarrier power, or a transmission mode, where
when the second UE uses a transmission mode 3 in Long Term
Evolution LTE, the first downlink control signaling further
includes a transport layer quantity of the second UE; when the
second UE uses a transmission mode 4 in the LTE, the first downlink
control signaling further includes a transport layer quantity and
precoding information of the second UE; or when the second UE uses
a transmission mode 5 in the LTE or a transmission mode 6 in the
LTE, the first downlink control signaling further includes
precoding information of the second UE.
[0009] With reference to the first or the second implementation
manner of the first aspect, in a third implementation manner of the
first aspect, the first sending unit is further configured to send
second downlink control signaling to the second UE, where the
second downlink control signaling includes demodulation reference
signal port information of the first UE and scheduling indication
information of the second UE, and the scheduling indication
information of the second UE in the second downlink control
signaling specifically includes one or more types of the following
information of the second UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, or redundancy
version information.
[0010] With reference to the first aspect, in a fourth
implementation manner of the first aspect, when the first
configuration unit configures the new transmission mode for the
first UE, the first UE demodulates data by using a cell-specific
reference signal, and the second UE also demodulates data by using
the cell-specific reference signal, the scheduling indication
information of the first UE in the first downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, redundancy version information, or
antenna port information; and the scheduling indication information
of the second UE in the first downlink control signaling
specifically includes one or more types of the following
information of the second UE: a ratio PA of a data subcarrier power
of an orthogonal frequency division multiplexing OFDM symbol
without a pilot to a pilot subcarrier power, a ratio PB of a data
subcarrier power of an OFDM symbol with a pilot to a pilot
subcarrier power, a radio network temporary identifier, or a
modulation and coding scheme, where when the second UE uses a
transmission mode 3 in Long Term Evolution LTE, the first downlink
control signaling further includes a transport layer quantity of
the second UE; when the second UE uses a transmission mode 4 in the
LTE, the first downlink control signaling further includes a
transport layer quantity and precoding information of the second
UE; or when the second UE uses a transmission mode 5 in the LTE or
a transmission mode 6 in the LTE, the first downlink control
signaling further includes precoding information of the second
UE.
[0011] With reference to the first aspect, in a fifth
implementation manner of the first aspect, when the first
configuration unit configures the new transmission mode for the
first UE, the first UE demodulates data by using a cell-specific
reference signal, and the second UE demodulates data by using a
user-specific reference signal, the scheduling indication
information of the first UE in the first downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, or redundancy version information; and
the scheduling indication information of the second UE in the first
downlink control signaling specifically includes one or more types
of the following information of the second UE: a radio network
temporary identifier, a transmission mode, a modulation and coding
scheme, antenna port information, a transport layer quantity, a
ratio of energy per resource element EPRE of data of the first UE
to EPRE of data of the second UE, a ratio of EPRE of data of the
first UE to EPRE of a dedicated pilot of the second UE, or
dedicated pilot power information.
[0012] With reference to the first, the second, the third, the
fourth, or the fifth implementation manner of the first aspect, in
a sixth implementation manner of the first aspect, the scheduling
indication information of the second UE in the first downlink
control signaling specifically further includes: new data indicator
information and/or redundancy version information of the second
UE.
[0013] According to a second aspect, a base station provided in an
embodiment of the present disclosure includes a second
configuration unit, configured to: configure a new transmission
mode for first user equipment UE and second UE, and notify the
first UE and the second UE of the configured new transmission mode,
where the new transmission mode indicates: a transmission signal of
the first UE and a transmission signal of the second UE multiplex a
same time-frequency resource, the first UE and the second UE are
located in a same cell, and the first UE and the second UE are
interfering UE of each other. The base station also includes a
second sending unit, configured to send same downlink control
signaling to the first UE and the second UE, so that the first UE
and the second UE demodulate, according to the downlink control
signaling, received data sent by the base station, where the
downlink control signaling includes scheduling indication
information of the first UE and scheduling indication information
of the second UE.
[0014] With reference to the second aspect, in a first
implementation manner of the second aspect, the scheduling
indication information of the first UE specifically includes one or
more types of the following information of the first UE: a resource
location indication, a modulation and coding scheme, a ratio of
energy per resource element EPRE of a pilot to EPRE of data of the
first UE, a ratio of EPRE of data of the first UE to EPRE of data
of the second UE, antenna port information, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information; and the scheduling indication
information of the second UE specifically includes one or more
types of the following information of the second UE: a resource
location indication, a modulation and coding scheme, a ratio of the
EPRE of the pilot to the EPRE of the data of the second UE, antenna
port information, a quantity of hybrid automatic repeat request
processes, new data indicator information, or redundancy version
information.
[0015] According to a third aspect, the present disclosure provides
user equipment UE, the UE is first UE. The first UE includes a
receiving unit, configured to receive configuration information
that is of a new transmission mode and is sent by a base station,
where the new transmission mode indicates: the base station
superposes a transmission signal, of second UE located in a same
cell as the first UE, on a time-frequency resource allocated by the
base station to the first UE, and the second UE is interfering UE
of the first UE. The receiving unit is further configured to
receive, in the new transmission mode, downlink control signaling
sent by the base station, where the downlink control signaling
includes scheduling indication information of the first UE and
scheduling indication information of the second UE. The first UE
also includes a demodulation unit, configured to demodulate,
according to the downlink control signaling, received data sent by
the base station.
[0016] With reference to the third aspect, in a first
implementation manner of the third aspect, in the new transmission
mode, when the first UE demodulates data by using a user-specific
reference signal, and the second UE also demodulates data by using
the user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, redundancy
version information, a ratio of energy per resource element EPRE of
a pilot to EPRE of data of the first UE, a transport layer
quantity, or antenna port information; and the scheduling
indication information of the second UE in the downlink control
signaling specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a modulation and coding scheme, antenna port information, a ratio
of the EPRE of the pilot to EPRE of data of the second UE, a ratio
of the EPRE of the data of the first UE to EPRE of data of the
second UE, data power information, or transport layer quantity
information.
[0017] With reference to the third aspect, in a second
implementation manner of the third aspect, in the new transmission
mode, when the first UE demodulates data by using a user-specific
reference signal, and the second UE demodulates data by using a
cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, redundancy version information, a
transport layer quantity, or antenna port information; and the
scheduling indication information of the second UE in the downlink
control signaling specifically includes one or more types of the
following information of the second UE: a radio network temporary
identifier, a modulation and coding scheme, a ratio PA of a data
subcarrier power of an orthogonal frequency division multiplexing
OFDM symbol without a pilot to a pilot subcarrier power, a ratio PB
of a data subcarrier power of an OFDM symbol with a pilot to a
pilot subcarrier power, or a transmission mode, where when the
second UE uses a transmission mode 3 in Long Term Evolution LTE,
the downlink control signaling further includes a transport layer
quantity of the second UE; when the second UE uses a transmission
mode 4 in the LTE, the downlink control signaling further includes
a transport layer quantity and precoding information of the second
UE; or when the second UE uses a transmission mode 5 in the LTE or
a transmission mode 6 in the LTE, the downlink control signaling
further includes precoding information of the second UE.
[0018] With reference to the third aspect, in a third
implementation manner of the third aspect, in the new transmission
mode, when the first UE demodulates data by using a cell-specific
reference signal, and the second UE also demodulates data by using
the cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, redundancy version information, or
antenna port information; and the scheduling indication information
of the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a ratio PA of a data subcarrier power of an orthogonal
frequency division multiplexing OFDM symbol without a pilot to a
pilot subcarrier power, a ratio PB of a data subcarrier power of an
OFDM symbol with a pilot to a pilot subcarrier power, a radio
network temporary identifier, or a modulation and coding scheme,
where when the second UE uses a transmission mode 3 in Long Term
Evolution LTE, the downlink control signaling further includes a
transport layer quantity of the second UE; when the second UE uses
a transmission mode 4 in the LTE, the downlink control signaling
further includes a transport layer quantity and precoding
information of the second UE; or when the second UE uses a
transmission mode 5 in the LTE or a transmission mode 6 in the LTE,
the downlink control signaling further includes precoding
information of the second UE.
[0019] With reference to the third aspect, in a fourth
implementation manner of the third aspect, in the new transmission
mode, when the first UE demodulates data by using a cell-specific
reference signal, and the second UE demodulates data by using a
user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, or redundancy version information; and
the scheduling indication information of the second UE in the
downlink control signaling specifically includes one or more types
of the following information of the second UE: a radio network
temporary identifier, a transmission mode, a modulation and coding
scheme, antenna port information, a transport layer quantity, a
ratio of energy per resource element EPRE of data of the first UE
to EPRE of data of the second UE, a ratio of EPRE of data of the
first UE to EPRE of a dedicated pilot of the second UE, or
dedicated pilot power information.
[0020] With reference to the first, the second, the third, or the
fourth implementation manner of the third aspect, in a fifth
implementation manner of the third aspect, the scheduling
indication information of the second UE in the downlink control
signaling specifically further includes: new data indicator
information and/or redundancy version information of the second
UE.
[0021] With reference to the third aspect, in a sixth
implementation manner of the third aspect, if the second UE also
receives the configuration information of the new transmission mode
and the downlink control signaling, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a ratio of energy per resource
element EPRE of a pilot to EPRE of data of the first UE, a ratio of
EPRE of data of the first UE to EPRE of data of the second UE,
antenna port information, a quantity of hybrid automatic repeat
request processes, new data indicator information, or redundancy
version information; and the scheduling indication information of
the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a resource location indication, a modulation and coding
scheme, a ratio of the EPRE of the pilot to the EPRE of the data of
the second UE, antenna port information, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information.
[0022] According to a fourth aspect, a base station provided in an
embodiment of the present disclosure includes a first processor and
a first transmitter. The first processor is configured to:
configure a new transmission mode for first user equipment UE, and
notify the first UE of the configured new transmission mode, where
the new transmission mode indicates: a transmission signal of
second UE located in a same cell as the first UE is superposed on a
time-frequency resource allocated to the first UE, and the second
UE is interfering UE of the first UE. The first processor is
further configured to control the first transmitter to send first
downlink control signaling to the first UE, so that the first UE
demodulates, according to the first downlink control signaling,
received data sent by the base station, where the first downlink
control signaling includes scheduling indication information of the
first UE and scheduling indication information of the second
UE.
[0023] With reference to the fourth aspect, in a first
implementation manner of the fourth aspect, when the first
processor configures the new transmission mode for the first UE,
the first UE demodulates data by using a user-specific reference
signal, and the second UE also demodulates data by using the
user-specific reference signal, the scheduling indication
information of the first UE in the first downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, redundancy
version information, a ratio of energy per resource element EPRE of
a pilot to EPRE of data of the first UE, a transport layer
quantity, or antenna port information; and the scheduling
indication information of the second UE in the first downlink
control signaling specifically includes one or more types of the
following information of the second UE: a radio network temporary
identifier, a modulation and coding scheme, antenna port
information, a ratio of the EPRE of the pilot to EPRE of data of
the second UE, a ratio of the EPRE of the data of the first UE to
EPRE of data of the second UE, data power information, or transport
layer quantity information.
[0024] With reference to the fourth aspect, in a second
implementation manner of the fourth aspect, when the first
processor configures the new transmission mode for the first UE,
the first UE demodulates data by using a user-specific reference
signal, and the second UE demodulates data by using a cell-specific
reference signal, the scheduling indication information of the
first UE in the first downlink control signaling specifically
includes one or more types of the following information of the
first UE: a resource location indication, a modulation and coding
scheme, rank information, a codebook matrix index, a quantity of
hybrid automatic repeat request processes, new data indicator
information, redundancy version information, a transport layer
quantity, or antenna port information; and the scheduling
indication information of the second UE in the first downlink
control signaling specifically includes one or more types of the
following information of the second UE: a radio network temporary
identifier, a modulation and coding scheme, a ratio PA of a data
subcarrier power of an orthogonal frequency division multiplexing
OFDM symbol without a pilot to a pilot subcarrier power, a ratio PB
of a data subcarrier power of an OFDM symbol with a pilot to a
pilot subcarrier power, or a transmission mode, where when the
second UE uses a transmission mode 3 in Long Term Evolution LTE,
the first downlink control signaling further includes a transport
layer quantity of the second UE; when the second UE uses a
transmission mode 4 in the LTE, the first downlink control
signaling further includes a transport layer quantity and precoding
information of the second UE; or when the second UE uses a
transmission mode 5 in the LTE or a transmission mode 6 in the LTE,
the first downlink control signaling further includes precoding
information of the second UE.
[0025] With reference to the first or the second implementation
manner of the fourth aspect, in a third implementation of the
fourth aspect, the first processor is further configured to control
the first transmitter to send second downlink control signaling to
the second UE, where the second downlink control signaling includes
demodulation reference signal port information of the first UE and
scheduling indication information of the second UE, and the
scheduling indication information of the second UE in the second
downlink control signaling specifically includes one or more types
of the following information of the second UE: a resource location
indication, a modulation and coding scheme, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information.
[0026] With reference to the fourth aspect, in a fourth
implementation manner of the fourth aspect, when the first
processor configures the new transmission mode for the first UE,
the first UE demodulates data by using a cell-specific reference
signal, and the second UE also demodulates data by using the
cell-specific reference signal, the scheduling indication
information of the first UE in the first downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, redundancy version information, or
antenna port information; and the scheduling indication information
of the second UE in the first downlink control signaling
specifically includes one or more types of the following
information of the second UE: a ratio PA of a data subcarrier power
of an orthogonal frequency division multiplexing OFDM symbol
without a pilot to a pilot subcarrier power, a ratio PB of a data
subcarrier power of an OFDM symbol with a pilot to a pilot
subcarrier power, a radio network temporary identifier, or a
modulation and coding scheme, where when the second UE uses a
transmission mode 3 in Long Term Evolution LTE, the first downlink
control signaling further includes a transport layer quantity of
the second UE; when the second UE uses a transmission mode 4 in the
LTE, the first downlink control signaling further includes a
transport layer quantity and precoding information of the second
UE; or when the second UE uses a transmission mode 5 in the LTE or
a transmission mode 6 in the LTE, the first downlink control
signaling further includes precoding information of the second
UE.
[0027] With reference to the fourth aspect, in a fifth
implementation manner of the fourth aspect, when the first
processor configures the new transmission mode for the first UE,
the first UE demodulates data by using a cell-specific reference
signal, and the second UE demodulates data by using a user-specific
reference signal, the scheduling indication information of the
first UE in the first downlink control signaling specifically
includes one or more types of the following information of the
first UE: a resource location indication, a modulation and coding
scheme, rank information, a codebook matrix index, a quantity of
hybrid automatic repeat request processes, new data indicator
information, or redundancy version information; and the scheduling
indication information of the second UE in the first downlink
control signaling specifically includes one or more types of the
following information of the second UE: a radio network temporary
identifier, a transmission mode, a modulation and coding scheme,
antenna port information, a transport layer quantity, a ratio of
energy per resource element EPRE of data of the first UE to EPRE of
data of the second UE, a ratio of EPRE of data of the first UE to
EPRE of a dedicated pilot of the second UE, or dedicated pilot
power information.
[0028] With reference to the first, the second, the third, the
fourth, or the fifth implementation manner of the fourth aspect, in
a sixth implementation manner of the fourth aspect, the scheduling
indication information of the second UE in the first downlink
control signaling specifically further includes: new data indicator
information and/or redundancy version information of the second
UE.
[0029] According to a fifth aspect, a base station provided in an
embodiment of the present disclosure includes a second processor
and a second transmitter. The second processor is configured to:
configure a new transmission mode for first user equipment UE and
second UE, and notify the first UE and the second UE of the
configured new transmission mode, where the new transmission mode
indicates: a transmission signal of the first UE and a transmission
signal of the second UE multiplex a same time-frequency resource,
the first UE and the second UE are located in a same cell, and the
first UE and the second UE are interfering UE of each other. The
second processor is further configured to control the second
transmitter to send same downlink control signaling to the first UE
and the second UE, so that the first UE and the second UE
demodulate, according to the downlink control signaling, received
data sent by the base station, where the downlink control signaling
includes scheduling indication information of the first UE and
scheduling indication information of the second UE.
[0030] With reference to the fifth aspect, in a first
implementation manner of the fifth aspect, the scheduling
indication information of the first UE specifically includes one or
more types of the following information of the first UE: a resource
location indication, a modulation and coding scheme, a ratio of
energy per resource element EPRE of a pilot to EPRE of data of the
first UE, a ratio of EPRE of data of the first UE to EPRE of data
of the second UE, antenna port information, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information; and the scheduling indication
information of the second UE specifically includes one or more
types of the following information of the second UE: a resource
location indication, a modulation and coding scheme, a ratio of the
EPRE of the pilot to the EPRE of the data of the second UE, antenna
port information, a quantity of hybrid automatic repeat request
processes, new data indicator information, or redundancy version
information.
[0031] According to a sixth aspect, an embodiment of the present
disclosure provides user equipment UE, the UE is first UE, and the
first UE includes a third processor and a receiver. The third
processor is configured to control the receiver to receive
configuration information of a new transmission mode, where the new
transmission mode indicates: the base station superposes a
transmission signal, of second UE located in a same cell as the
first UE, on a time-frequency resource allocated by the base
station to the first UE, and the second UE is interfering UE of the
first UE. The third processor is further configured to control, in
the new transmission mode, the receiver to receive downlink control
signaling sent by the base station, where the downlink control
signaling includes scheduling indication information of the first
UE and scheduling indication information of the second UE. The
third processor is further configured to demodulate, according to
the downlink control signaling, received data sent by the base
station.
[0032] With reference to the sixth aspect, in a first
implementation manner of the sixth aspect, in the new transmission
mode, when the first UE demodulates data by using a user-specific
reference signal, and the second UE also demodulates data by using
the user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, redundancy
version information, a ratio of energy per resource element EPRE of
a pilot to EPRE of data of the first UE, a transport layer
quantity, or antenna port information; and the scheduling
indication information of the second UE in the downlink control
signaling specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a modulation and coding scheme, antenna port information, a ratio
of the EPRE of the pilot to EPRE of data of the second UE, a ratio
of the EPRE of the data of the first UE to EPRE of data of the
second UE, data power information, or transport layer quantity
information.
[0033] With reference to the sixth aspect, in a second
implementation manner of the sixth aspect, in the new transmission
mode, when the first UE demodulates data by using a user-specific
reference signal, and the second UE demodulates data by using a
cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, redundancy version information, a
transport layer quantity, or antenna port information; and the
scheduling indication information of the second UE in the downlink
control signaling specifically includes one or more types of the
following information of the second UE: a radio network temporary
identifier, a modulation and coding scheme, a ratio PA of a data
subcarrier power of an orthogonal frequency division multiplexing
OFDM symbol without a pilot to a pilot subcarrier power, a ratio PB
of a data subcarrier power of an OFDM symbol with a pilot to a
pilot subcarrier power, or a transmission mode, where when the
second UE uses a transmission mode 3 in Long Term Evolution LTE,
the downlink control signaling further includes a transport layer
quantity of the second UE; when the second UE uses a transmission
mode 4 in the LTE, the downlink control signaling further includes
a transport layer quantity and precoding information of the second
UE; or when the second UE uses a transmission mode 5 in the LTE or
a transmission mode 6 in the LTE, the downlink control signaling
further includes precoding information of the second UE.
[0034] With reference to the sixth aspect, in a third
implementation manner of the sixth aspect, in the new transmission
mode, when the first UE demodulates data by using a cell-specific
reference signal, and the second UE also demodulates data by using
the cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, redundancy version information, or
antenna port information; and the scheduling indication information
of the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a ratio PA of a data subcarrier power of an orthogonal
frequency division multiplexing OFDM symbol without a pilot to a
pilot subcarrier power, a ratio PB of a data subcarrier power of an
OFDM symbol with a pilot to a pilot subcarrier power, a radio
network temporary identifier, or a modulation and coding scheme,
where when the second UE uses a transmission mode 3 in Long Term
Evolution LTE, the downlink control signaling further includes a
transport layer quantity of the second UE; when the second UE uses
a transmission mode 4 in the LTE, the downlink control signaling
further includes a transport layer quantity and precoding
information of the second UE; or when the second UE uses a
transmission mode 5 in the LTE or a transmission mode 6 in the LTE,
the downlink control signaling further includes precoding
information of the second UE.
[0035] With reference to the sixth aspect, in a fourth
implementation manner of the sixth aspect, in the new transmission
mode, when the first UE demodulates data by using a cell-specific
reference signal, and the second UE demodulates data by using a
user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, or redundancy version information; and
the scheduling indication information of the second UE in the
downlink control signaling specifically includes one or more types
of the following information of the second UE: a radio network
temporary identifier, a transmission mode, a modulation and coding
scheme, antenna port information, a transport layer quantity, a
ratio of energy per resource element EPRE of data of the first UE
to EPRE of data of the second UE, a ratio of EPRE of data of the
first UE to EPRE of a dedicated pilot of the second UE, or
dedicated pilot power information.
[0036] With reference to the first, the second, the third, or the
fourth implementation manner of the sixth aspect, in a fifth
implementation manner of the sixth aspect, the scheduling
indication information of the second UE in the downlink control
signaling specifically further includes: new data indicator
information and/or redundancy version information of the second
UE.
[0037] With reference to the sixth aspect, in a sixth
implementation manner of the sixth aspect, if the second UE also
receives the configuration information of the new transmission mode
and the downlink control signaling, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a ratio of energy per resource
element EPRE of a pilot to EPRE of data of the first UE, a ratio of
EPRE of data of the first UE to EPRE of data of the second UE,
antenna port information, a quantity of hybrid automatic repeat
request processes, new data indicator information, or redundancy
version information; and the scheduling indication information of
the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a resource location indication, a modulation and coding
scheme, a ratio of the EPRE of the pilot to the EPRE of the data of
the second UE, antenna port information, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information.
[0038] According to a seventh aspect, an embodiment of the present
disclosure provides a non-orthogonal multiple access transmission
method, where the method is applied to a base station. The method
includes configuring a new transmission mode for first user
equipment UE, and notifying the first UE of the configured new
transmission mode, where the new transmission mode indicates: a
transmission signal of second UE located in a same cell as the
first UE is superposed on a time-frequency resource allocated to
the first UE, and the second UE is interfering UE of the first UE.
The method also includes sending first downlink control signaling
to the first UE, so that the first UE demodulates, according to the
first downlink control signaling, received data sent by the base
station, where the first downlink control signaling includes
scheduling indication information of the first UE and scheduling
indication information of the second UE.
[0039] With reference to the seventh aspect, in a first
implementation manner of the seventh aspect, when the new
transmission mode is configured for the first UE, the first UE
demodulates data by using a user-specific reference signal, and the
second UE also demodulates data by using the user-specific
reference signal, the scheduling indication information of the
first UE in the first downlink control signaling specifically
includes one or more types of the following information of the
first UE: a resource location indication, a modulation and coding
scheme, a quantity of hybrid automatic repeat request processes,
new data indicator information, redundancy version information, a
ratio of energy per resource element EPRE of a pilot to EPRE of
data of the first UE, a transport layer quantity, or antenna port
information; and the scheduling indication information of the
second UE in the first downlink control signaling specifically
includes one or more types of the following information of the
second UE: a radio network temporary identifier, a modulation and
coding scheme, antenna port information, a ratio of the EPRE of the
pilot to EPRE of data of the second UE, a ratio of the EPRE of the
data of the first UE to EPRE of data of the second UE, data power
information, or transport layer quantity information.
[0040] With reference to the seventh aspect, in a second
implementation manner of the seventh aspect, when the new
transmission mode is configured for the first UE, the first UE
demodulates data by using a user-specific reference signal, and the
second UE demodulates data by using a cell-specific reference
signal, the scheduling indication information of the first UE in
the first downlink control signaling specifically includes one or
more types of the following information of the first UE: a resource
location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
redundancy version information, a transport layer quantity, or
antenna port information; and the scheduling indication information
of the second UE in the first downlink control signaling
specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a modulation and coding scheme, a ratio PA of a data subcarrier
power of an orthogonal frequency division multiplexing OFDM symbol
without a pilot to a pilot subcarrier power, a ratio PB of a data
subcarrier power of an OFDM symbol with a pilot to a pilot
subcarrier power, or a transmission mode, where when the second UE
uses a transmission mode 3 in Long Term Evolution LTE, the first
downlink control signaling further includes a transport layer
quantity of the second UE; when the second UE uses a transmission
mode 4 in the LTE, the first downlink control signaling further
includes a transport layer quantity and precoding information of
the second UE; or when the second UE uses a transmission mode 5 in
the LTE or a transmission mode 6 in the LTE, the first downlink
control signaling further includes precoding information of the
second UE.
[0041] With reference to the first or the second implementation
manner of the seventh aspect, in a third implementation manner of
the seventh aspect, the method further includes: sending second
downlink control signaling to the second UE, where the second
downlink control signaling includes demodulation reference signal
port information of the first UE and scheduling indication
information of the second UE, and the scheduling indication
information of the second UE in the second downlink control
signaling specifically includes one or more types of the following
information of the second UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, or redundancy
version information.
[0042] With reference to the seventh aspect, in a fourth
implementation manner of the seventh aspect, when the new
transmission mode is configured for the first UE, the first UE
demodulates data by using a cell-specific reference signal, and the
second UE also demodulates data by using the cell-specific
reference signal, the scheduling indication information of the
first UE in the first downlink control signaling specifically
includes one or more types of the following information of the
first UE: a resource location indication, a modulation and coding
scheme, rank information, a codebook matrix index, a quantity of
hybrid automatic repeat request processes, new data indicator
information, redundancy version information, or antenna port
information; and the scheduling indication information of the
second UE in the first downlink control signaling specifically
includes one or more types of the following information of the
second UE: a ratio PA of a data subcarrier power of an orthogonal
frequency division multiplexing OFDM symbol without a pilot to a
pilot subcarrier power, a ratio PB of a data subcarrier power of an
OFDM symbol with a pilot to a pilot subcarrier power, a radio
network temporary identifier, or a modulation and coding scheme,
where when the second UE uses a transmission mode 3 in Long Term
Evolution LTE, the first downlink control signaling further
includes a transport layer quantity of the second UE; when the
second UE uses a transmission mode 4 in the LTE, the first downlink
control signaling further includes a transport layer quantity and
precoding information of the second UE; or when the second UE uses
a transmission mode 5 in the LTE or a transmission mode 6 in the
LTE, the first downlink control signaling further includes
precoding information of the second UE.
[0043] With reference to the seventh aspect, in a fifth
implementation manner of the seventh aspect, when the new
transmission mode is configured for the first UE, the first UE
demodulates data by using a cell-specific reference signal, and the
second UE demodulates data by using a user-specific reference
signal, the scheduling indication information of the first UE in
the first downlink control signaling specifically includes one or
more types of the following information of the first UE: a resource
location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information; and the scheduling indication
information of the second UE in the first downlink control
signaling specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a transmission mode, a modulation and coding scheme, antenna port
information, a transport layer quantity, a ratio of energy per
resource element EPRE of data of the first UE to EPRE of data of
the second UE, a ratio of EPRE of data of the first UE to EPRE of a
dedicated pilot of the second UE, or dedicated pilot power
information.
[0044] With reference to the first, the second, the third, the
fourth, or the fifth implementation manner of the seventh aspect,
in a sixth implementation manner of the seventh aspect, the
scheduling indication information of the second UE in the first
downlink control signaling specifically further includes: new data
indicator information and/or redundancy version information of the
second UE.
[0045] According to an eighth aspect, an embodiment of the present
disclosure provides a non-orthogonal multiple access transmission
method, where the method is applied to a base station. The method
includes configuring a new transmission mode for first user
equipment UE and second UE, and notifying the first UE and the
second UE of the configured new transmission mode, where the new
transmission mode indicates: a transmission signal of the first UE
and a transmission signal of the second UE multiplex a same
time-frequency resource, the first UE and the second UE are located
in a same cell, and the first UE and the second UE are interfering
UE of each other. The method includes sending same downlink control
signaling to the first UE and the second UE, so that the first UE
and the second UE demodulate, according to the downlink control
signaling, received data sent by the base station, where the
downlink control signaling includes scheduling indication
information of the first UE and scheduling indication information
of the second UE.
[0046] With reference to the eighth aspect, in a first
implementation manner of the eighth aspect, the scheduling
indication information of the first UE specifically includes one or
more types of the following information of the first UE: a resource
location indication, a modulation and coding scheme, a ratio of
energy per resource element EPRE of a pilot to EPRE of data of the
first UE, a ratio of EPRE of data of the first UE to EPRE of data
of the second UE, antenna port information, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information; and the scheduling indication
information of the second UE specifically includes one or more
types of the following information of the second UE: a resource
location indication, a modulation and coding scheme, a ratio of the
EPRE of the pilot to the EPRE of the data of the second UE, antenna
port information, a quantity of hybrid automatic repeat request
processes, new data indicator information, or redundancy version
information.
[0047] According to a ninth aspect, an embodiment of the present
disclosure provides a non-orthogonal multiple access transmission
method, where the method is applied to user equipment UE, the UE is
first UE. The method includes receiving configuration information
that is of a new transmission mode and is sent by a base station,
where the new transmission mode indicates: the base station
superposes a transmission signal, of second UE located in a same
cell as the first UE, on a time-frequency resource allocated by the
base station to the first UE, and the second UE is interfering UE
of the first UE. The method also includes receiving, in the new
transmission mode, downlink control signaling sent by the base
station, where the downlink control signaling includes scheduling
indication information of the first UE and scheduling indication
information of the second UE. The method also includes
demodulating, according to the downlink control signaling, received
data sent by the base station.
[0048] With reference to the ninth aspect, in a first
implementation manner of the ninth aspect, in the new transmission
mode, when the first UE demodulates data by using a user-specific
reference signal, and the second UE also demodulates data by using
the user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, redundancy
version information, a ratio of energy per resource element EPRE of
a pilot to EPRE of data of the first UE, a transport layer
quantity, or antenna port information; and the scheduling
indication information of the second UE in the downlink control
signaling specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a modulation and coding scheme, antenna port information, a ratio
of the EPRE of the pilot to EPRE of data of the second UE, a ratio
of the EPRE of the data of the first UE to EPRE of data of the
second UE, data power information, or transport layer quantity
information.
[0049] With reference to the ninth aspect, in a second
implementation manner of the ninth aspect, in the new transmission
mode, when the first UE demodulates data by using a user-specific
reference signal, and the second UE demodulates data by using a
cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, redundancy version information, a
transport layer quantity, or antenna port information; and the
scheduling indication information of the second UE in the downlink
control signaling specifically includes one or more types of the
following information of the second UE: a radio network temporary
identifier, a modulation and coding scheme, a ratio PA of a data
subcarrier power of an orthogonal frequency division multiplexing
OFDM symbol without a pilot to a pilot subcarrier power, a ratio PB
of a data subcarrier power of an OFDM symbol with a pilot to a
pilot subcarrier power, or a transmission mode, where when the
second UE uses a transmission mode 3 in Long Term Evolution LTE,
the downlink control signaling further includes a transport layer
quantity of the second UE; when the second UE uses a transmission
mode 4 in the LTE, the downlink control signaling further includes
a transport layer quantity and precoding information of the second
UE; or when the second UE uses a transmission mode 5 in the LTE or
a transmission mode 6 in the LTE, the downlink control signaling
further includes precoding information of the second UE.
[0050] With reference to the ninth aspect, in a third
implementation manner of the ninth aspect, in the new transmission
mode, when the first UE demodulates data by using a cell-specific
reference signal, and the second UE also demodulates data by using
the cell-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, redundancy version information, or
antenna port information; and the scheduling indication information
of the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a ratio PA of a data subcarrier power of an orthogonal
frequency division multiplexing OFDM symbol without a pilot to a
pilot subcarrier power, a ratio PB of a data subcarrier power of an
OFDM symbol with a pilot to a pilot subcarrier power, a radio
network temporary identifier, or a modulation and coding scheme,
where when the second UE uses a transmission mode 3 in Long Term
Evolution LTE, the downlink control signaling further includes a
transport layer quantity of the second UE; when the second UE uses
a transmission mode 4 in the LTE, the downlink control signaling
further includes a transport layer quantity and precoding
information of the second UE; or when the second UE uses a
transmission mode 5 in the LTE or a transmission mode 6 in the LTE,
the downlink control signaling further includes precoding
information of the second UE.
[0051] With reference to the ninth aspect, in a fourth
implementation manner of the ninth aspect, in the new transmission
mode, when the first UE demodulates data by using a cell-specific
reference signal, and the second UE demodulates data by using a
user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, rank information, a codebook matrix
index, a quantity of hybrid automatic repeat request processes, new
data indicator information, or redundancy version information; and
the scheduling indication information of the second UE in the
downlink control signaling specifically includes one or more types
of the following information of the second UE: a radio network
temporary identifier, a transmission mode, a modulation and coding
scheme, antenna port information, a transport layer quantity, a
ratio of energy per resource element EPRE of data of the first UE
to EPRE of data of the second UE, a ratio of EPRE of data of the
first UE to EPRE of a dedicated pilot of the second UE, or
dedicated pilot power information.
[0052] With reference to the first, the second, the third, or the
fourth implementation manner of the ninth aspect, in a fifth
implementation manner of the ninth aspect, the scheduling
indication information of the second UE in the downlink control
signaling specifically further includes: new data indicator
information and/or redundancy version information of the second
UE.
[0053] With reference to the ninth aspect, in a sixth
implementation manner of the ninth aspect, if the second UE also
receives the configuration information of the new transmission mode
and the downlink control signaling, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a ratio of energy per resource
element EPRE of a pilot to EPRE of data of the first UE, a ratio of
EPRE of data of the first UE to EPRE of data of the second UE,
antenna port information, a quantity of hybrid automatic repeat
request processes, new data indicator information, or redundancy
version information; and the scheduling indication information of
the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a resource location indication, a modulation and coding
scheme, a ratio of the EPRE of the pilot to the EPRE of the data of
the second UE, antenna port information, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information.
[0054] It can be learned from the foregoing technical solutions
that the embodiments of the present disclosure have the following
advantages.
[0055] In the embodiments of the present disclosure, a base station
configures a new transmission mode for first UE, and notifies the
first UE of the configured new transmission mode, where the new
transmission mode indicates: a transmission signal of second UE
located in a same cell as the first UE is superposed on a
time-frequency resource allocated to the first UE, and the second
UE is interfering UE of the first UE, that is, the base station
configures a NOMA transmission mode for the first UE; and then,
sends first downlink control signaling to the first UE, so that the
first UE demodulates, according to the first downlink control
signaling, received data sent by the base station, where the first
downlink control signaling includes scheduling indication
information of the first UE and scheduling indication information
of the second UE. In the embodiments of the present disclosure,
because first downlink control signaling includes scheduling
indication information of second UE, first UE may first cancel
interference data of the second UE according to the scheduling
indication information of the second UE that is included in the
first downlink control signaling, and successfully demodulates data
of the first UE. The second UE may directly demodulate data of the
second UE without performing interference cancellation. Therefore,
in the present disclosure, a NOMA transmission manner is introduced
into an LTE system, and spectrum utilization is improved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0056] To describe the technical solutions in the embodiments of
the present disclosure more clearly, the following briefly
introduces the accompanying drawings required for describing the
embodiments. Apparently, the accompanying drawings in the following
description show merely some embodiments of the present disclosure,
and a person of ordinary skill in the art may still derive other
drawings from these accompanying drawings without creative
efforts.
[0057] FIG. 1 is a schematic diagram of an embodiment of a base
station according to the present disclosure;
[0058] FIG. 2 is a schematic diagram of another embodiment of a
base station according to the present disclosure;
[0059] FIG. 3 is a schematic diagram of another embodiment of a
base station according to the present disclosure;
[0060] FIG. 4 is a schematic diagram of another embodiment of a
base station according to the present disclosure;
[0061] FIG. 5 is a schematic diagram of an embodiment of UE
according to the present disclosure;
[0062] FIG. 6 is a schematic diagram of another embodiment of UE
according to the present disclosure;
[0063] FIG. 7 is a schematic diagram of an embodiment of a
non-orthogonal multiple access transmission method according to the
present disclosure;
[0064] FIG. 8 is a schematic diagram of another embodiment of a
non-orthogonal multiple access transmission method according to the
present disclosure; and
[0065] FIG. 9 is a schematic diagram of another embodiment of a
non-orthogonal multiple access transmission method according to the
present disclosure.
DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
[0066] The following describes the technical solutions in the
embodiments of the present disclosure with reference to the
accompanying drawings in the embodiments of the present disclosure.
Apparently, the described embodiments are merely a part rather than
all of the embodiments of the present disclosure. All other
embodiments obtained by a person of ordinary skill in the art based
on the embodiments of the present disclosure without creative
efforts shall fall within the protection scope of the present
disclosure.
[0067] The present disclosure provides a non-orthogonal multiple
access transmission method, a base station, and UE, so that a NOMA
transmission manner can be introduced into an LTE system, and
spectrum utilization can be improved. In the embodiments of the
present disclosure, first UE mainly refers to UE located in a cell
center, and second UE mainly refers to UE that is located in a same
cell as the first UE and that is located on a cell edge. A base
station may determine, according to information such as a reference
signal received power (RSRP), reference signal received quality
(RSRQ), or radio channel quality (CQI) that is reported by each UE,
which UE is the first UE and which UE is the second UE.
[0068] Referring to FIG. 1, FIG. 1 is a schematic diagram of an
embodiment of a base station according to the present disclosure. A
base station 100 in this embodiment includes a first configuration
unit 101 and a first sending unit 102.
[0069] The first configuration unit 101 is configured to: configure
a new transmission mode for first user equipment (UE), and notify
the first UE of the configured new transmission mode, where the new
transmission mode indicates: a transmission signal of second UE
located in a same cell as the first UE is superposed on a
time-frequency resource allocated to the first UE, and the second
UE is interfering UE of the first UE; and the interfering UE
indicates that the transmission signal of the second UE and a
transmission signal of the first UE are orthogonal in none of a
time domain, a frequency domain, a space domain, or a code domain,
that is, the first configuring unit 101 configures a NOMA
transmission mode for the first UE.
[0070] The first sending unit 102 is configured to send first
downlink control signaling to the first UE, so that the first UE
demodulates, according to the first downlink control signaling, a
received data signal sent by the base station, where the first
downlink control signaling includes scheduling indication
information of the first UE and scheduling indication information
of the second UE.
[0071] Because when a new transmission mode is configured for first
UE, a transmission signal of second UE is superposed on a
time-frequency resource allocated by the base station to the first
UE, and a transmission signal of the first UE and the transmission
signal of the second UE multiplex a same time-frequency resource,
for the first UE, the transmission signal of the second UE is an
interfering signal, and before demodulating the transmission signal
of the first UE, the first UE first needs to demodulate the
transmission signal of the second UE and cancel the transmission
signal of the second UE. However, in this embodiment, because first
downlink control signaling sent to the first UE includes scheduling
indication information of the second UE, the first UE may identify
and cancel transmission data of the second UE according to the
scheduling indication information of the second UE that is included
in the first downlink control signaling, and successfully
demodulates data of the first UE. The second UE may directly
demodulate data of the second UE without performing interference
cancellation. Therefore, in the present disclosure, a NOMA
transmission manner is introduced into an LTE system, and spectrum
utilization is improved.
[0072] When the first configuration unit 101 configures the new
transmission mode for the first UE, the first configuration unit
101 may also configure the new transmission mode for the second UE,
or may configure an original transmission mode in LTE for the
second UE, for example, TM1 to TM9. When the first configuration
unit 101 configures the new transmission mode for the first UE, the
first UE may demodulate data by using a user-specific reference
signal, or may demodulate data by using a cell-specific reference
signal. Descriptions are separately given in the following.
[0073] In a first case, when the first configuration unit 101
configures the new transmission mode for the first UE, the first UE
demodulates data by using a user-specific reference signal, and the
second UE demodulates data by using a user-specific reference
signal, the scheduling indication information of the first UE in
the first downlink control signaling specifically includes one or
more types of the following information of the first UE: a resource
location indication, a modulation and coding scheme, a quantity of
hybrid automatic repeat request processes, new data indicator
information, redundancy version information, a ratio of energy per
resource element (EPRE) of a pilot to EPRE of data of the first UE,
a transport layer quantity, or antenna port information; and the
scheduling indication information of the second UE in the first
downlink control signaling specifically includes one or more types
of the following information of the second UE: a radio network
temporary identifier, a modulation and coding scheme, antenna port
information, a ratio of the EPRE of the pilot to EPRE of data of
the second UE, a ratio of the EPRE of the data of the first UE to
EPRE of data of the second UE, data power information, or transport
layer quantity information.
[0074] When the NOMA transmission mode is not introduced into LTE,
the base station sends, to each UE, downlink control signaling that
carries information related to each UE. When the NOMA transmission
mode is introduced into LTE, it may be understood as follows: For
the first UE, the base station adds the scheduling indication
information of the second UE to downlink control signaling
originally to be sent to the first UE (for example, the adding the
scheduling indication information of the second UE may be
implemented by adding a field to the original downlink control
signaling), so as to form new downlink control signaling (that is,
the first downlink control signaling); replaces, with the first
downlink control signaling, the downlink control signaling
originally to be sent to the first UE; and sends the first downlink
control signaling to the first UE. For the second UE, the base
station does not send new downlink control signaling to the second
UE, that is, for the second UE, the base station still continues to
use downlink control signaling originally to be sent to the second
UE, and the second UE does not know that the base station sends a
NOMA modulation signal.
[0075] In a second case, when the first configuration unit 101
configures the new transmission mode for the first UE, the first UE
demodulates data by using a user-specific reference signal, and the
second UE demodulates data by using a cell-specific reference
signal, the scheduling indication information of the first UE in
the first downlink control signaling specifically includes one or
more types of the following information of the first UE: a resource
location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
redundancy version information, a transport layer quantity, or
antenna port information; and the scheduling indication information
of the second UE in the first downlink control signaling
specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a modulation and coding scheme, a ratio PA of a data subcarrier
power of an orthogonal frequency division multiplexing (OFDM)
symbol without a pilot to a pilot subcarrier power, a ratio PB of a
data subcarrier power of an OFDM symbol with a pilot to a pilot
subcarrier power, or a transmission mode, where when the second UE
uses a transmission mode 3 in LTE, the first downlink control
signaling further includes a transport layer quantity of the second
UE; when the second UE uses a transmission mode 4 in LTE, the first
downlink control signaling further includes a transport layer
quantity and precoding information of the second UE; or when the
second UE uses a transmission mode 5 in LTE or a transmission mode
6 in LTE, the first downlink control signaling further includes
precoding information of the second UE.
[0076] In this case, it may be still considered that the base
station does not send new downlink control signaling to the second
UE, and the second UE does not know that the base station sends a
NOMA modulation signal.
[0077] In the foregoing two cases, the first sending unit 102 may
also send new downlink control signaling (that is, second downlink
control signaling) to the second UE. The second downlink control
signaling includes demodulation reference signal (DMRS) port
information of the first UE and scheduling indication information
of the second UE. The scheduling indication information of the
second UE in the second downlink control signaling specifically
includes one or more types of the following information of the
second UE: a resource location indication, a modulation and coding
scheme, a quantity of hybrid automatic repeat request processes,
new data indicator information, or redundancy version information.
In this case, it may be understood as follows: For the second UE,
the base station adds the DMRS port information of the first UE to
downlink control signaling originally to be sent to the second UE
(for example, the adding the DMRS port information of the first UE
may be implemented by adding a field to the original downlink
control signaling), so as to form new downlink control signaling
(that is, the second downlink control signaling); replaces, with
the second downlink control signaling, the downlink control
signaling originally to be sent to the second UE; and sends the
second downlink control signaling to the second UE. In this case,
the second UE knows that the base station sends a NOMA modulation
signal.
[0078] In the foregoing several cases, because the first UE
demodulates data by using a user-specific reference signal, there
is a resource mapping conflict between the user-specific reference
signal and data of the second UE. The conflict may be resolved
according to the DMRS port information of the first UE that is
included in the second downlink control signaling and by using the
following method: a DMRS pilot of the first UE and the data of the
second UE are directly superposed, or the data of the second UE is
punctured at a DMRS pilot location of the first UE.
[0079] In a third case, when the first configuration unit 101
configures the new transmission mode for the first UE, the first UE
demodulates data by using a cell-specific reference signal, and the
second UE demodulates data by using a cell-specific reference
signal, the scheduling indication information of the first UE in
the first downlink control signaling specifically includes one or
more types of the following information of the first UE: a resource
location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
redundancy version information, or antenna port information; and
the scheduling indication information of the second UE in the first
downlink control signaling specifically includes one or more types
of the following information of the second UE: a ratio PA of a data
subcarrier power of an OFDM symbol without a pilot to a pilot
subcarrier power, a ratio PB of a data subcarrier power of an OFDM
symbol with a pilot to a pilot subcarrier power, a radio network
temporary identifier, or a modulation and coding scheme, where when
the second UE uses a transmission mode 3 in LTE, the first downlink
control signaling further includes a transport layer quantity of
the second UE; when the second UE uses a transmission mode 4 in
LTE, the first downlink control signaling further includes a
transport layer quantity and precoding information of the second
UE; or when the second UE uses a transmission mode 5 in LTE or a
transmission mode 6 in LTE, the first downlink control signaling
further includes precoding information of the second UE.
[0080] For the second UE, it may be considered that the base
station does not send new downlink control signaling to the second
UE, and still continues to use original downlink control signaling
for the second UE, and the second UE does not know that the base
station sends a NOMA modulation signal.
[0081] In a fourth case, when the first configuration unit 101
configures the new transmission mode for the first UE, the first UE
demodulates data by using a cell-specific reference signal, and the
second UE demodulates data by using a user-specific reference
signal, the scheduling indication information of the first UE in
the first downlink control signaling specifically includes one or
more types of the following information of the first UE: a resource
location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information; and the scheduling indication
information of the second UE in the first downlink control
signaling specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a transmission mode, a modulation and coding scheme, antenna port
information, a transport layer quantity, a ratio of EPRE of data of
the first UE to EPRE of data of the second UE, a ratio of EPRE of
data of the first UE to EPRE of a dedicated pilot of the second UE,
or dedicated pilot power information.
[0082] For the second UE, it may be considered that the base
station does not send new downlink control signaling to the second
UE, and still continues to use original downlink control signaling
for the second UE, and the second UE does not know that the base
station sends a NOMA modulation signal.
[0083] In addition, in the foregoing various cases, the first
downlink control signaling sent by the first sending unit 102 to
the first UE may further include new data indicator (NDI)
information and/or redundancy version information of the second UE.
In this way, after receiving the first downlink control signaling,
the first UE may determine, by determining an NDI or a redundancy
version of the second UE, whether the data of the second UE is
retransmitted data. If the data of the second UE is retransmitted
data, the first UE may perform interference reconstruction with
reference to a previous result of interfering signal estimation,
and perform interference cancellation according to a result of
interference reconstruction, so that interfering signal estimation
correctness can be improved.
[0084] Referring to FIG. 2 in the following, another embodiment of
a base station in the present disclosure includes a first processor
201 and a first transmitter 202.
[0085] The first processor 201 is configured to: configure a new
transmission mode for first UE, and notify the first UE of the
configured new transmission mode, where the new transmission mode
indicates: a transmission signal of second UE located in a same
cell as the first UE is superposed on a time-frequency resource
allocated to the first UE, and the second UE is interfering UE of
the first UE; and the interfering UE indicates that the
transmission signal of the second UE and a transmission signal of
the first UE are orthogonal in none of a time domain, a frequency
domain, a space domain, or a code domain.
[0086] The first processor 201 is further configured to control the
first transmitter 202 to send first downlink control signaling to
the first UE, so that the first UE demodulates, according to the
first downlink control signaling, received data sent by the base
station, where the first downlink control signaling includes
scheduling indication information of the first UE and scheduling
indication information of the second UE.
[0087] In addition, a base station 200 in this embodiment may be
further configured to execute other actions that can be executed by
the base station 100 in the foregoing embodiment, and details are
not described herein again. For details, refer to the foregoing
embodiment.
[0088] The foregoing two embodiments describe a base station that
separately generates different downlink control signaling for first
UE and second UE and that performs scheduling for different UEs by
using different downlink control signaling. The following
embodiments describe a base station that generates same downlink
control signaling for different UEs and that performs scheduling by
using same downlink control signaling. Referring to FIG. 3, a base
station 300 in this embodiment includes a second configuration unit
301 and a second sending unit 302.
[0089] The second configuration unit 301 is configured to:
configure a new transmission mode for first UE and second UE, and
notify the first UE and the second UE of the configured new
transmission mode, where the new transmission mode indicates: a
transmission signal of the first UE and a transmission signal of
the second UE multiplex a same time-frequency resource, the first
UE and the second UE are located in a same cell, and the first UE
and the second UE are interfering UE of each other; and the
interfering UE indicates that the transmission signal of the second
UE and the transmission signal of the first UE are orthogonal in
none of a time domain, a frequency domain, a space domain, or a
code domain.
[0090] The second sending unit 302 is configured to send same
downlink control signaling to the first UE and the second UE, so
that the first UE and the second UE demodulate, according to the
downlink control signaling, a received data signal sent by the base
station, where the downlink control signaling includes scheduling
indication information of the first UE and scheduling indication
information of the second UE.
[0091] The scheduling indication information of the first UE
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a ratio of EPRE of a pilot to EPRE of
data of the first UE, a ratio of EPRE of data of the first UE to
EPRE of data of the second UE, antenna port information, a quantity
of hybrid automatic repeat request processes, new data indicator
information, or redundancy version information. The scheduling
indication information of the second UE specifically includes one
or more types of the following information of the second UE: a
resource location indication, a modulation and coding scheme, a
ratio of the EPRE of the pilot to the EPRE of the data of the
second UE, antenna port information, a quantity of hybrid automatic
repeat request processes, new data indicator information, or
redundancy version information.
[0092] It should be noted that in this embodiment, because the
transmission signal of the first UE and the transmission signal of
the second UE multiplex a same time-frequency resource, the
resource location indication of the first UE is the same as the
resource location indication of the second UE. In specific
implementation, the resource location indication of the first UE
and the resource location indication of the second UE may be
replaced with a common resource location indication.
[0093] In this embodiment, because scheduling indication
information of another UE is configured in downlink control
signaling to be sent by a second sending unit 302 to each UE, each
UE may successfully demodulate data of each UE according to
information included in the downlink control signaling. Therefore,
in the present disclosure, a NOMA transmission manner is introduced
into an LTE system, and spectrum utilization is improved. In
addition, each piece of downlink control signaling indicates
scheduling information of two multiplexing users, and a base
station schedules multiple users by using same downlink control
signaling, thereby reducing signaling overheads.
[0094] Referring to FIG. 4, another embodiment of a base station in
the present disclosure includes a second processor 401 and a second
transmitter 402.
[0095] The second processor 401 is configured to: configure a new
transmission mode for first UE and second UE, and notify the first
UE and the second UE of the configured new transmission mode, where
the new transmission mode indicates: a transmission signal of the
first UE and a transmission signal of the second UE multiplex a
same time-frequency resource, the first UE and the second UE are
located in a same cell, and the first UE and the second UE are
interfering UE of each other; and the interfering UE indicates that
the transmission signal of the second UE and the transmission
signal of the first UE are orthogonal in none of a time domain, a
frequency domain, a space domain, or a code domain.
[0096] The second processor 401 is further configured to control
the second transmitter 402 to send same downlink control signaling
to the first UE and the second UE, so that the first UE and the
second UE demodulate, according to the downlink control signaling,
received data sent by the base station, where the downlink control
signaling includes scheduling indication information of the first
UE and scheduling indication information of the second UE.
[0097] The scheduling indication information of the first UE
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a ratio of EPRE of a pilot to EPRE of
data of the first UE, a ratio of EPRE of data of the first UE to
EPRE of data of the second UE, antenna port information, a quantity
of hybrid automatic repeat request processes, new data indicator
information, or redundancy version information. The scheduling
indication information of the second UE specifically includes one
or more types of the following information of the second UE: a
resource location indication, a modulation and coding scheme, a
ratio of the EPRE of the pilot to the EPRE of the data of the
second UE, antenna port information, a quantity of hybrid automatic
repeat request processes, new data indicator information, or
redundancy version information.
[0098] It should be noted that in this embodiment, because the
transmission signal of the first UE and the transmission signal of
the second UE multiplex a same time-frequency resource, the
resource location indication of the first UE is the same as the
resource location indication of the second UE. In specific
implementation, the resource location indication of the first UE
and the resource location indication of the second UE may be
replaced with a common resource location indication.
[0099] The following describes UE provided in an embodiment of the
present disclosure. Referring to FIG. 5, the UE in this embodiment
is first UE, and the UE in this embodiment includes: a receiving
unit 501, configured to receive configuration information that is
of a new transmission mode and is sent by a base station, where the
new transmission mode indicates: the base station superposes a
transmission signal, of second UE located in a same cell as the
first UE, on a time-frequency resource allocated by the base
station to the first UE, and the second UE is interfering UE of the
first UE, where the receiving unit 501 is further configured to
receive, in the new transmission mode, downlink control signaling
sent by the base station, where the downlink control signaling
includes scheduling indication information of the first UE and
scheduling indication information of the second UE; and a
demodulation unit 503, configured to demodulate, according to the
downlink control signaling, received data sent by the base
station.
[0100] Specifically, when the base station configures the new
transmission mode for the first UE, the base station notifies the
first UE of the configured new transmission mode (for example, the
notification may be implemented by sending signaling), that is, the
base station sends the configuration information of the new
transmission mode to the first UE. If the base station does not
configure the new transmission mode for the first UE, that is, the
base station does not introduce a NOMA transmission mode, but
configures an original transmission mode in LTE, the base station
correspondingly sends original downlink control signaling to the
first UE, and the first UE demodulates data according to the
original downlink control signaling. In this case, there is no
time-frequency resource multiplexing, and spectrum utilization is
not improved.
[0101] In the new transmission mode, the demodulation unit 503 of
the first UE may demodulate data by using a user-specific reference
signal, or may demodulate data by using a cell-specific reference
signal. Descriptions are separately given in the following.
[0102] In a first case, in the new transmission mode, when the
first UE demodulates data by using a user-specific reference
signal, and the second UE demodulates data by using the
user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, redundancy
version information, a ratio of energy per resource element EPRE of
a pilot to EPRE of data of the first UE, a transport layer
quantity, or antenna port information; and the scheduling
indication information of the second UE in the downlink control
signaling specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a modulation and coding scheme, antenna port information, a ratio
of the EPRE of the pilot to EPRE of data of the second UE, a ratio
of the EPRE of the data of the first UE to EPRE of data of the
second UE, data power information, or transport layer quantity
information.
[0103] In this case, compared with the downlink control signaling
originally sent to the first UE, the downlink control signaling
sent to the first UE includes the scheduling indication information
of the second UE. For the second UE, it may be considered that the
base station does not send new downlink control signaling to the
second UE, and still continues to use original downlink control
signaling for the second UE, and the second UE does not know that
the base station sends a NOMA modulation signal.
[0104] In a second case, in the new transmission mode, when the
first UE demodulates data by using a user-specific reference
signal, and the second UE demodulates data by using a cell-specific
reference signal, the scheduling indication information of the
first UE in the downlink control signaling specifically includes
one or more types of the following information of the first UE: a
resource location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
redundancy version information, a transport layer quantity, or
antenna port information; and the scheduling indication information
of the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a radio network temporary identifier, a modulation and
coding scheme, a ratio PA of a data subcarrier power of an OFDM
symbol without a pilot to a pilot subcarrier power, a ratio PB of a
data subcarrier power of an OFDM symbol with a pilot to a pilot
subcarrier power, or a transmission mode, where when the second UE
uses a transmission mode 3 in LTE, the downlink control signaling
further includes a transport layer quantity of the second UE; when
the second UE uses a transmission mode 4 in LTE, the downlink
control signaling further includes a transport layer quantity and
precoding information of the second UE; or when the second UE uses
a transmission mode 5 in LTE or a transmission mode 6 in LTE, the
downlink control signaling further includes precoding information
of the second UE.
[0105] In this case, compared with the downlink control signaling
originally sent to the first UE, the downlink control signaling
sent to the first UE includes the scheduling indication information
of the second UE. For the second UE, it may be considered that the
base station does not send new downlink control signaling to the
second UE, and still continues to use original downlink control
signaling for the second UE, and the second UE does not know that
the base station sends a NOMA modulation signal.
[0106] In the foregoing two cases, the base station may also send
new downlink control signaling to the second UE (that is, the base
station adds DMRS port information of the first UE to the downlink
control signaling originally to be sent to the second UE). In this
case, the downlink control signaling sent to the second UE further
includes one or more types of the following information of the
second UE: a resource location indication, a modulation and coding
scheme, a quantity of hybrid automatic repeat request processes,
new data indicator information, or redundancy version information.
In this case, the second UE knows that the base station sends a
NOMA modulation signal.
[0107] In the foregoing several cases, because the first UE
demodulates data by using a user-specific reference signal, there
is a resource mapping conflict between the user-specific reference
signal and data of the second UE. The conflict may be resolved
according to the DMRS port information of the first UE and by using
the following method: a DMRS pilot of the first UE and the data of
the second UE are directly superposed, or the data of the second UE
is punctured at a DMRS pilot location of the first UE.
[0108] In a third case, in the new transmission mode, when the
first UE demodulates data by using a cell-specific reference
signal, and the second UE demodulates data by using a cell-specific
reference signal, the scheduling indication information of the
first UE in the downlink control signaling specifically includes
one or more types of the following information of the first UE: a
resource location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
redundancy version information, or antenna port information; and
the scheduling indication information of the second UE in the
downlink control signaling specifically includes one or more types
of the following information of the second UE: a ratio PA of a data
subcarrier power of an OFDM symbol without a pilot to a pilot
subcarrier power, a ratio PB of a data subcarrier power of an OFDM
symbol with a pilot to a pilot subcarrier power, a radio network
temporary identifier, or a modulation and coding scheme, where when
the second UE uses a transmission mode 3 in LTE, the downlink
control signaling further includes a transport layer quantity of
the second UE; when the second UE uses a transmission mode 4 in the
LTE, the downlink control signaling further includes a transport
layer quantity and precoding information of the second UE; or when
the second UE uses a transmission mode 5 in LTE or a transmission
mode 6 in LTE, the downlink control signaling further includes
precoding information of the second UE.
[0109] For the second UE, it may be considered that the base
station does not send new downlink control signaling to the second
UE, and still continues to use original downlink control signaling
for the second UE, and the second UE does not know that the base
station sends a NOMA modulation signal.
[0110] In a fourth case, in the new transmission mode, when the
first UE demodulates data by using a cell-specific reference
signal, and the second UE demodulates data by using a user-specific
reference signal, the scheduling indication information of the
first UE in the downlink control signaling specifically includes
one or more types of the following information of the first UE: a
resource location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information; and the scheduling indication
information of the second UE in the downlink control signaling
specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a transmission mode, a modulation and coding scheme, antenna port
information, a transport layer quantity, a ratio of energy per
resource element EPRE of data of the first UE to EPRE of data of
the second UE, a ratio of EPRE of data of the first UE to EPRE of a
dedicated pilot of the second UE, or dedicated pilot power
information.
[0111] For the second UE, it may be considered that the base
station does not send new downlink control signaling to the second
UE, and still continues to use original downlink control signaling
for the second UE, and the second UE does not know that the base
station sends a NOMA modulation signal.
[0112] In addition, in the foregoing various cases, the scheduling
indication information of the second UE in the downlink control
signaling sent to the first UE specifically further includes: new
data indicator information and/or redundancy version information of
the second UE. The demodulation unit 503 determines, according to
the new data indicator information and/or the redundancy version
information of the second UE, whether the transmission data of the
second UE is retransmitted data. If the transmission data of the
second UE is retransmitted data, the demodulation unit 503 performs
interference reconstruction with reference to an existing result of
estimating the transmission signal of the second UE, and performs
interference cancellation according to a result of interference
reconstruction.
[0113] For the foregoing several cases, it is equivalent to that
the base station sends different downlink control signaling to
different UEs, so as to implement scheduling for different UEs. In
practical application, the base station may further configure the
new transmission mode for both the first UE and the second UE, and
send same downlink control signaling to the first UE and the second
UE. In this case, the scheduling indication information of the
first UE in the downlink control signaling specifically includes
one or more types of the following information of the first UE: a
resource location indication, a modulation and coding scheme, a
ratio of EPRE of a pilot to EPRE of data of the first UE, a ratio
of EPRE of data of the first UE to EPRE of data of the second UE,
antenna port information, a quantity of hybrid automatic repeat
request processes, new data indicator information, or redundancy
version information; and the scheduling indication information of
the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a resource location indication, a modulation and coding
scheme, a ratio of the EPRE of the pilot to the EPRE of the data of
the second UE, antenna port information, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information.
[0114] In this embodiment, because downlink control signaling
received by a receiving unit includes scheduling indication
information of second UE, first UE may identify and cancel
transmission data of the second UE according to the scheduling
indication information of the second UE that is included in the
downlink control signaling, and successfully demodulates data of
the first UE. The second UE may directly demodulate data of the
second UE without performing interference cancellation. Therefore,
in the present disclosure, a NOMA transmission manner is introduced
into an LTE system, and spectrum utilization is improved.
[0115] Referring to FIG. 6, in another embodiment, UE includes a
third processor 601 and a receiver 602.
[0116] The third processor 601 is configured to control the
receiver 602 to receive configuration information of a new
transmission mode, where the new transmission mode indicates: a
base station superposes a transmission signal, of second UE located
in a same cell as the first UE, on a time-frequency resource
allocated by the base station to the first UE, and the second UE is
interfering UE of the first UE.
[0117] The third processor 601 is further configured to control, in
the new transmission mode, the receiver 602 to receive downlink
control signaling sent by the base station, where the downlink
control signaling includes scheduling indication information of the
first UE and scheduling indication information of the second
UE.
[0118] The third processor 601 is further configured to demodulate,
according to the downlink control signaling, received data sent by
the base station.
[0119] In addition, UE 600 in this embodiment may be further
configured to execute other actions that can be executed by the UE
500 in the foregoing embodiment, and details are not described
herein again. For details, refer to the foregoing embodiment.
[0120] The following describes a non-orthogonal multiple access
transmission method provided in the present disclosure. Referring
to FIG. 7, a method in this embodiment is applied to a base
station, and the method in this embodiment includes the following
steps:
[0121] 701. Configure a new transmission mode for first UE, where
the new transmission mode indicates: a transmission signal of
second UE located in a same cell as the first UE is superposed on a
time-frequency resource allocated to the first UE, and the second
UE is interfering UE of the first UE; and the interfering UE
indicates that the transmission signal of the second UE and a
transmission signal of the first UE are orthogonal in none of a
time domain, a frequency domain, a space domain, or a code
domain.
[0122] 702. Send first downlink control signaling to the first UE,
so that the first UE demodulates, according to the first downlink
control signaling, received data sent by the base station, where
the first downlink control signaling includes scheduling indication
information of the first UE and scheduling indication information
of the second UE.
[0123] In specific implementation, when the new transmission mode
is configured for the first UE, the first UE may demodulate data by
using a user-specific reference signal, or may demodulate data by
using a cell-specific reference signal. Descriptions are separately
given in the following.
[0124] In a first case, when the new transmission mode is
configured for the first UE, the first UE demodulates data by using
a user-specific reference signal, and the second UE demodulates
data by using a user-specific reference signal, the scheduling
indication information of the first UE in the first downlink
control signaling specifically includes one or more types of the
following information of the first UE: a resource location
indication, a modulation and coding scheme, a quantity of hybrid
automatic repeat request processes, new data indicator information,
redundancy version information, a ratio of EPRE of a pilot to EPRE
of data of the first UE, a transport layer quantity, or antenna
port information; and the scheduling indication information of the
second UE in the first downlink control signaling specifically
includes one or more types of the following information of the
second UE: a radio network temporary identifier, a modulation and
coding scheme, antenna port information, a ratio of the EPRE of the
pilot to EPRE of data of the second UE, a ratio of the EPRE of the
data of the first UE to EPRE of data of the second UE, data power
information, or transport layer quantity information.
[0125] When a NOMA transmission mode is not introduced into LTE,
the base station sends, to each UE, downlink control signaling that
carries information related to each UE. When a NOMA transmission
mode is introduced into LTE, it may be understood as follows: For
the first UE, the base station adds the scheduling indication
information of the second UE to downlink control signaling
originally to be sent to the first UE (for example, the adding the
scheduling indication information of the second UE may be
implemented by adding a field to the original downlink control
signaling), so as to form new downlink control signaling (that is,
the first downlink control signaling); replaces, with the first
downlink control signaling, the downlink control signaling
originally to be sent to the first UE; and sends the first downlink
control signaling to the first UE. For the second UE, the base
station does not send new downlink control signaling to the second
UE, that is, for the second UE, the base station still continues to
use downlink control signaling originally to be sent to the second
UE, and the second UE does not know that the base station sends a
NOMA modulation signal.
[0126] In a second case, when the new transmission mode is
configured for the first UE, the first UE demodulates data by using
a user-specific reference signal, and the second UE demodulates
data by using a cell-specific reference signal, the scheduling
indication information of the first UE in the first downlink
control signaling specifically includes one or more types of the
following information of the first UE: a resource location
indication, a modulation and coding scheme, rank information, a
codebook matrix index, a quantity of hybrid automatic repeat
request processes, new data indicator information, redundancy
version information, a transport layer quantity, or antenna port
information; and the scheduling indication information of the
second UE in the first downlink control signaling specifically
includes one or more types of the following information of the
second UE: a radio network temporary identifier, a modulation and
coding scheme, a ratio PA of a data subcarrier power of an OFDM
symbol without a pilot to a pilot subcarrier power, a ratio PB of a
data subcarrier power of an OFDM symbol with a pilot to a pilot
subcarrier power, or a transmission mode, where when the second UE
uses a transmission mode 3 in LTE, the first downlink control
signaling further includes a transport layer quantity of the second
UE; when the second UE uses a transmission mode 4 in LTE, the first
downlink control signaling further includes a transport layer
quantity and precoding information of the second UE; or when the
second UE uses a transmission mode 5 in LTE or a transmission mode
6 in LTE, the first downlink control signaling further includes
precoding information of the second UE.
[0127] In this case, it may be still considered that the base
station does not send new downlink control signaling to the second
UE, and the second UE does not know that the base station sends a
NOMA modulation signal.
[0128] In the foregoing two cases, the base station may also send
new downlink control signaling (that is, second downlink control
signaling) to the second UE. The second downlink control signaling
includes DMRS port information of the first UE and scheduling
indication information of the second UE. The scheduling indication
information of the second UE in the second downlink control
signaling specifically includes one or more types of the following
information of the second UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, or redundancy
version information. In this case, it may be understood as follows:
For the second UE, the base station adds the DMRS port information
of the first UE to downlink control signaling originally to be sent
to the second UE (for example, the adding the DMRS port information
of the first UE may be implemented by adding a field to the
original downlink control signaling), so as to form new downlink
control signaling (that is, the second downlink control signaling);
replaces, with the second downlink control signaling, the downlink
control signaling originally to be sent to the second UE; and sends
the second downlink control signaling to the second UE. In this
case, the second UE knows that the base station sends a NOMA
modulation signal.
[0129] In the foregoing several cases, because the first UE
demodulates data by using a user-specific reference signal, there
is a resource mapping conflict between the user-specific reference
signal and data of the second UE. The conflict may be resolved
according to the DMRS port information of the first UE that is
included in the second downlink control signaling and by using the
following method: a DMRS pilot of the first UE and the data of the
second UE are directly superposed, or the data of the second UE is
punctured at a DMRS pilot location of the first UE.
[0130] In a third case, when the new transmission mode is
configured for the first UE, the first UE demodulates data by using
a cell-specific reference signal, and the second UE demodulates
data by using a cell-specific reference signal, the scheduling
indication information of the first UE in the first downlink
control signaling specifically includes one or more types of the
following information of the first UE: a resource location
indication, a modulation and coding scheme, rank information, a
codebook matrix index, a quantity of hybrid automatic repeat
request processes, new data indicator information, redundancy
version information, or antenna port information; and the
scheduling indication information of the second UE in the first
downlink control signaling specifically includes one or more types
of the following information of the second UE: a ratio PA of a data
subcarrier power of an OFDM symbol without a pilot to a pilot
subcarrier power, a ratio PB of a data subcarrier power of an OFDM
symbol with a pilot to a pilot subcarrier power, a radio network
temporary identifier, or a modulation and coding scheme, where when
the second UE uses a transmission mode 3 in LTE, the first downlink
control signaling further includes a transport layer quantity of
the second UE; when the second UE uses a transmission mode 4 in
LTE, the first downlink control signaling further includes a
transport layer quantity and precoding information of the second
UE; or when the second UE uses a transmission mode 5 in LTE or a
transmission mode 6 in LTE, the first downlink control signaling
further includes precoding information of the second UE.
[0131] For the second UE, it may be considered that the base
station does not send new downlink control signaling to the second
UE, and still continues to use original downlink control signaling
for the second UE, and the second UE does not know that the base
station sends a NOMA modulation signal.
[0132] In a fourth case, when the new transmission mode is
configured for the first UE, the first UE demodulates data by using
a cell-specific reference signal, and the second UE demodulates
data by using a user-specific reference signal, the scheduling
indication information of the first UE in the first downlink
control signaling specifically includes one or more types of the
following information of the first UE: a resource location
indication, a modulation and coding scheme, rank information, a
codebook matrix index, a quantity of hybrid automatic repeat
request processes, new data indicator information, or redundancy
version information; and the scheduling indication information of
the second UE in the first downlink control signaling specifically
includes one or more types of the following information of the
second UE: a radio network temporary identifier, a transmission
mode, a modulation and coding scheme, antenna port information, a
transport layer quantity, a ratio of EPRE of data of the first UE
to EPRE of data of the second UE, a ratio of EPRE of data of the
first UE to EPRE of a dedicated pilot of the second UE, or
dedicated pilot power information.
[0133] For the second UE, it may be considered that the base
station does not send new downlink control signaling to the second
UE, and still continues to use original downlink control signaling
for the second UE, and the second UE does not know that the base
station sends a NOMA modulation signal.
[0134] In addition, in the foregoing various cases, the first
downlink control signaling sent to the first UE may further include
NDI information and/or redundancy version information of the second
UE. In this way, after receiving the first downlink control
signaling, the first UE may determine, by determining an NDI or a
redundancy version of the second UE, whether the data of the second
UE is retransmitted data. If the data of the second UE is
retransmitted data, the first UE may perform interference
reconstruction with reference to a previous result of interfering
signal estimation, and perform interference cancellation according
to a result of interference reconstruction, so that interfering
signal estimation correctness can be improved.
[0135] In this embodiment of the present disclosure, because first
downlink control signaling includes scheduling indication
information of second UE, first UE may cancel interference data of
the second UE according to the scheduling indication information of
the second UE that is included in the first downlink control
signaling, and successfully demodulates data of the first UE. The
second UE may directly demodulate data of the second UE without
performing interference cancellation. Therefore, in the present
disclosure, a NOMA transmission manner is introduced into an LTE
system, and spectrum utilization is improved.
[0136] The foregoing embodiment describes a method in which a base
station separately generates different downlink control signaling
for first UE and second UE, and performs scheduling for different
UEs by using different downlink control signaling. The following
embodiment describes a method in which same downlink control
signaling is generated for different UEs and scheduling is
performed by using same downlink control signaling. Referring to
FIG. 8, a method in this embodiment is applied to a base station,
and the method in this embodiment includes the following steps.
[0137] 801. Configure a new transmission mode for first UE and
second UE, where the new transmission mode indicates: a
transmission signal of the first UE and a transmission signal of
the second UE multiplex a same time-frequency resource, the first
UE and the second UE are located in a same cell, and the first UE
and the second UE are interfering UE of each other; and the
interfering UE indicates that the transmission signal of the second
UE and the transmission signal of the first UE are orthogonal in
none of a time domain, a frequency domain, a space domain, or a
code domain.
[0138] 802. Send same downlink control signaling to the first UE
and the second UE, so that the first UE and the second UE
demodulate, according to the downlink control signaling, received
data sent by the base station, where the downlink control signaling
includes scheduling indication information of the first UE and
scheduling indication information of the second UE.
[0139] The scheduling indication information of the first UE
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a ratio of EPRE of a pilot to EPRE of
data of the first UE, a ratio of EPRE of data of the first UE to
EPRE of data of the second UE, antenna port information, a quantity
of hybrid automatic repeat request processes, new data indicator
information, or redundancy version information. The scheduling
indication information of the second UE specifically includes one
or more types of the following information of the second UE: a
resource location indication, a modulation and coding scheme, a
ratio of the EPRE of the pilot to the EPRE of the data of the
second UE, antenna port information, a quantity of hybrid automatic
repeat request processes, new data indicator information, or
redundancy version information.
[0140] It should be noted that in this embodiment, because the
transmission signal of the first UE and the transmission signal of
the second UE multiplex a same time-frequency resource, the
resource location indication of the first UE is the same as the
resource location indication of the second UE. In specific
implementation, the resource location indication of the first UE
and the resource location indication of the second UE may be
replaced with a common resource location indication.
[0141] In this embodiment, because scheduling indication
information of another UE is configured in downlink control
signaling to be sent to each UE, each UE may successfully
demodulate data of each UE according to information included in the
downlink control signaling. Therefore, in the present disclosure, a
NOMA transmission manner is introduced into an LTE system, and
spectrum utilization is improved. In addition, each piece of
downlink control signaling indicates scheduling information of two
multiplexing users, and a base station schedules multiple users by
using same downlink control signaling, thereby reducing signaling
overheads.
[0142] Referring to FIG. 9, FIG. 9 is another embodiment of a
non-orthogonal multiple access transmission method according to the
present disclosure. The method in this embodiment is mainly applied
to UE, the UE is first UE, and the method in this embodiment
includes the followings steps.
[0143] 901. Receive configuration information that is of a new
transmission mode and is sent by a base station, where the new
transmission mode indicates: the base station superposes a
transmission signal, of second UE located in a same cell as the
first UE, on a time-frequency resource allocated by the base
station to the first UE, and the second UE is interfering UE of the
first UE.
[0144] 902. Receive, in the new transmission mode, downlink control
signaling sent by the base station, where the downlink control
signaling includes scheduling indication information of the first
UE and scheduling indication information of the second UE.
[0145] 903. Demodulate, according to the downlink control
signaling, received data sent by the base station.
[0146] Specifically, when the base station configures the new
transmission mode for the first UE, the base station notifies the
first UE of the configured new transmission mode (for example, the
notification may be implemented by sending signaling), that is, the
base station sends the configuration information of the new
transmission mode to the first UE. If the base station does not
configure the new transmission mode for the first UE, that is, the
base station does not introduce a NOMA transmission mode, but
configures an original transmission mode in LTE, the base station
correspondingly sends original downlink control signaling to the
first UE, and the first UE demodulates data according to the
original downlink control signaling. In this case, there is no
time-frequency resource multiplexing, and spectrum utilization is
not improved.
[0147] In the new transmission mode, the first UE may demodulate
data by using a user-specific reference signal, or may demodulate
data by using a cell-specific reference signal. Descriptions are
separately given in the following.
[0148] In a first case, in the new transmission mode, when the
first UE demodulates data by using a user-specific reference
signal, and the second UE demodulates data by using the
user-specific reference signal, the scheduling indication
information of the first UE in the downlink control signaling
specifically includes one or more types of the following
information of the first UE: a resource location indication, a
modulation and coding scheme, a quantity of hybrid automatic repeat
request processes, new data indicator information, redundancy
version information, a ratio of energy per resource element EPRE of
a pilot to EPRE of data of the first UE, a transport layer
quantity, or antenna port information; and the scheduling
indication information of the second UE in the downlink control
signaling specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a modulation and coding scheme, antenna port information, a ratio
of the EPRE of the pilot to EPRE of data of the second UE, a ratio
of the EPRE of the data of the first UE to EPRE of data of the
second UE, data power information, or transport layer quantity
information.
[0149] In this case, compared with the downlink control signaling
originally sent to the first UE, the downlink control signaling
sent to the first UE includes the scheduling indication information
of the second UE. For the second UE, it may be considered that the
base station does not send new downlink control signaling to the
second UE, and still continues to use original downlink control
signaling for the second UE, and the second UE does not know that
the base station sends a NOMA modulation signal.
[0150] In a second case, in the new transmission mode, when the
first UE demodulates data by using a user-specific reference
signal, and the second UE demodulates data by using a cell-specific
reference signal, the scheduling indication information of the
first UE in the downlink control signaling specifically includes
one or more types of the following information of the first UE: a
resource location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
redundancy version information, a transport layer quantity, or
antenna port information; and the scheduling indication information
of the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a radio network temporary identifier, a modulation and
coding scheme, a ratio PA of a data subcarrier power of an OFDM
symbol without a pilot to a pilot subcarrier power, a ratio PB of a
data subcarrier power of an OFDM symbol with a pilot to a pilot
subcarrier power, or a transmission mode, where when the second UE
uses a transmission mode 3 in LTE, the downlink control signaling
further includes a transport layer quantity of the second UE; when
the second UE uses a transmission mode 4 in LTE, the downlink
control signaling further includes a transport layer quantity and
precoding information of the second UE; or when the second UE uses
a transmission mode 5 in LTE or a transmission mode 6 in LTE, the
downlink control signaling further includes precoding information
of the second UE.
[0151] In this case, compared with the downlink control signaling
originally sent to the first UE, the downlink control signaling
sent to the first UE includes the scheduling indication information
of the second UE. For the second UE, it may be considered that the
base station does not send new downlink control signaling to the
second UE, and still continues to use original downlink control
signaling for the second UE, and the second UE does not know that
the base station sends a NOMA modulation signal.
[0152] In the foregoing two cases, the base station may also send
new downlink control signaling to the second UE (that is, the base
station adds DMRS port information of the first UE to the downlink
control signaling originally to be sent to the second UE). In this
case, the downlink control signaling sent to the second UE further
includes one or more types of the following information of the
second UE: a resource location indication, a modulation and coding
scheme, a quantity of hybrid automatic repeat request processes,
new data indicator information, or redundancy version information.
In this case, the second UE knows that the base station sends a
NOMA modulation signal.
[0153] In the foregoing several cases, because the first UE
demodulates data by using a user-specific reference signal, there
is a resource mapping conflict between the user-specific reference
signal and data of the second UE. The conflict may be resolved
according to the DMRS port information of the first UE and by using
the following method: a DMRS pilot of the first UE and the data of
the second UE are directly superposed, or the data of the second UE
is punctured at a DMRS pilot location of the first UE.
[0154] In a third case, in the new transmission mode, when the
first UE demodulates data by using a cell-specific reference
signal, and the second UE demodulates data by using a cell-specific
reference signal, the scheduling indication information of the
first UE in the downlink control signaling specifically includes
one or more types of the following information of the first UE: a
resource location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
redundancy version information, or antenna port information; and
the scheduling indication information of the second UE in the
downlink control signaling specifically includes one or more types
of the following information of the second UE: a ratio PA of a data
subcarrier power of an OFDM symbol without a pilot to a pilot
subcarrier power, a ratio PB of a data subcarrier power of an OFDM
symbol with a pilot to a pilot subcarrier power, a radio network
temporary identifier, or a modulation and coding scheme, where when
the second UE uses a transmission mode 3 in LTE, the downlink
control signaling further includes a transport layer quantity of
the second UE; when the second UE uses a transmission mode 4 in the
LTE, the downlink control signaling further includes a transport
layer quantity and precoding information of the second UE; or when
the second UE uses a transmission mode 5 in LTE or a transmission
mode 6 in LTE, the downlink control signaling further includes
precoding information of the second UE.
[0155] For the second UE, it may be considered that the base
station does not send new downlink control signaling to the second
UE, and still continues to use original downlink control signaling
for the second UE, and the second UE does not know that the base
station sends a NOMA modulation signal.
[0156] In a fourth case, in the new transmission mode, when the
first UE demodulates data by using a cell-specific reference
signal, and the second UE demodulates data by using a user-specific
reference signal, the scheduling indication information of the
first UE in the downlink control signaling specifically includes
one or more types of the following information of the first UE: a
resource location indication, a modulation and coding scheme, rank
information, a codebook matrix index, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information; and the scheduling indication
information of the second UE in the downlink control signaling
specifically includes one or more types of the following
information of the second UE: a radio network temporary identifier,
a transmission mode, a modulation and coding scheme, antenna port
information, a transport layer quantity, a ratio of energy per
resource element EPRE of data of the first UE to EPRE of data of
the second UE, a ratio of EPRE of data of the first UE to EPRE of a
dedicated pilot of the second UE, or dedicated pilot power
information.
[0157] For the second UE, it may be considered that the base
station does not send new downlink control signaling to the second
UE, and still continues to use original downlink control signaling
for the second UE, and the second UE does not know that the base
station sends a NOMA modulation signal.
[0158] In addition, in the foregoing various cases, the scheduling
indication information of the second UE in the downlink control
signaling sent to the first UE specifically further includes: new
data indicator information and/or redundancy version information of
the second UE. The first UE determines, according to the new data
indicator information and/or the redundancy version information of
the second UE, whether the transmission data of the second UE is
retransmitted data. If the transmission data of the second UE is
retransmitted data, the first UE performs interference
reconstruction with reference to an existing result of estimating
the transmission signal of the second UE, and performs interference
cancellation according to a result of interference
reconstruction.
[0159] For the foregoing several cases, it is equivalent to that
the base station sends different downlink control signaling to
different UEs, so as to implement scheduling for different UEs. In
practical application, the base station may further configure the
new transmission mode for both the first UE and the second UE, and
send same downlink control signaling to the first UE and the second
UE. In this case, the scheduling indication information of the
first UE in the downlink control signaling specifically includes
one or more types of the following information of the first UE: a
resource location indication, a modulation and coding scheme, a
ratio of EPRE of a pilot to EPRE of data of the first UE, a ratio
of EPRE of data of the first UE to EPRE of data of the second UE,
antenna port information, a quantity of hybrid automatic repeat
request processes, new data indicator information, or redundancy
version information; and the scheduling indication information of
the second UE in the downlink control signaling specifically
includes one or more types of the following information of the
second UE: a resource location indication, a modulation and coding
scheme, a ratio of the EPRE of the pilot to the EPRE of the data of
the second UE, antenna port information, a quantity of hybrid
automatic repeat request processes, new data indicator information,
or redundancy version information.
[0160] In this embodiment, because downlink control signaling
received by first UE includes scheduling indication information of
second UE, the first UE may identify and cancel transmission data
of the second UE according to the scheduling indication information
of the second UE that is included in the downlink control
signaling, and successfully demodulates data of the first UE. The
second UE may directly demodulate data of the second UE without
performing interference cancellation. Therefore, in the present
disclosure, a NOMA transmission manner is introduced into an LTE
system, and spectrum utilization is improved.
[0161] It should be noted that when both the first UE and the
second UE demodulate data by using a user-specific reference
signal, the first UE and the second UE may use a same antenna port,
or may use different antenna ports. No specific limitation is
imposed in the present disclosure.
[0162] In addition, it should be noted that by using the method
provided in the present disclosure, the NOMA transmission manner
may be further combined with another communications system, and is
not limited to being combined with the LTE system. No specific
limitation is imposed herein.
[0163] In addition, the described apparatus embodiment is merely an
example. The units described as separate parts may or may not be
physically separate, and parts displayed as units may or may not be
physical units, may be located in one position, or may be
distributed on multiple network units. Some or all of the modules
may be selected according to actual needs to achieve the objectives
of the solutions of the embodiments. In addition, in the
accompanying drawings of the apparatus embodiments provided in the
present disclosure, connection relationships between modules
indicate that the modules have communication connections with each
other, and may be specifically implemented as one or more
communications buses or signal cables. A person of ordinary skill
in the art may understand and implement the embodiments of the
present disclosure without creative efforts.
[0164] Based on the description of the foregoing implementation
manners, a person skilled in the art may clearly understand that
the present disclosure may be implemented by software in addition
to necessary universal hardware, or by dedicated hardware,
including a dedicated integrated circuit, a dedicated CPU, a
dedicated memory, a dedicated component, and the like. Generally,
any function that can be performed by a computer program can be
easily implemented by using corresponding hardware. Moreover, a
specific hardware structure used to achieve a same function may be
in various forms, for example, in a form of an analog circuit, a
digital circuit, or a dedicated circuit. However, as for the
present disclosure, software program implementation is a better
implementation manner in most cases. Based on such an
understanding, the technical solutions of the present disclosure
essentially or the part contributing to the prior art may be
implemented in a form of a software product. The software product
is stored in a readable storage medium, such as a floppy disk, a
USB flash drive, a removable hard disk, a read-only memory (ROM), a
random access memory (RAM), a magnetic disk, or an optical disc of
a computer, and includes several instructions for instructing a
computer device (which may be a personal computer, a server, a
network device, or the like) to perform the methods described in
the embodiments of the present disclosure.
[0165] The foregoing describes in detail a non-orthogonal multiple
access transmission method, a base station, and UE that are
provided in the embodiments of the present disclosure. A person of
ordinary skill in the art may make modifications to the specific
implementation manners and the application scope according to the
ideas of the embodiments of the present disclosure. Therefore, the
content of this specification shall not be construed as a
limitation to the present disclosure.
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